Sound-reproducer.



C. W. EILERS.

SOUND REPRODUCER.

APPLICATION FILED Aue.2a, 1915.

C. W. EILERS.

SOUND REPRODUCER. APPLICATION FILED AUG.28,' 1915.

Patented May 2, 1916. 2 SHEETS-SHEET 2 w r! W Ez'ler's,

flmwvm witness:

rron

oAnn-W. EAST ST. LOUIS, ILLINOIS.

all'whojm it may) concern:

[Begzitknown'that 1,04% Burns, a

citizen of theUnited States, residing at East St.uLouis, in the county of t. fGla1r and :StateofLIllinois,"have in ted new and nsefullmprovenients n dReproducers,

ofwhlch the fell-owing 1s specification.

This invention relates to sound -reprducersand more particularlyto means for attaching the needle arm to the casing and.

has for its primary object the provision of a connection betweenthe needle arm and the casing whereby the needlearm can freely of parts,"hereinafter fully described and vibrate,

Another object the invention is the arrangementof the parts whereby the action of the lever can be accomplished forincreasing the action of the needle arm upon the diaphragm:without materially effecting the pressure between the needle and the indentationin the record.

A further object of/the invention is the provision ofwedge-shaped bearings whereby the plate and needle arm are allowed to rock with a minimum amount of friction.

' A still further object of the invention is the arrangement of the needle arm interme diate the wedge-shapedbearings and the needlemeceiving socket. 4

The invention consists in the features of constriiction, combination and arrangement 3 claimed, reference being had to the accompanying drawings, in whichal- Figure a front elevation of my im proved form of reproducer. Fig. 2 is a side elevation thereof. Fig.3'is a rear view with the tone arm in section. Fig. i is a bottom plan view. Fig. 3 is a liorimliital section on line 5-5 of Fig.1 1; Fig; (i is a section on line6- 6 of Fig.1. Fig. .7 isa perspective view'of the plate. Fig. a vertical sec- .tion on line 8--8"o"E.Fig. 1.

In the drawings, the numeral 1 designates the casingotthe r-eproducerand as shown is provided \vifthlhe usual peripheral flange J 2 provided with an annular shoulder that receives the peripheralv edgeqportion of a l 1. eri'oratedf cover The casing is. fnr'thhr provided with an annular:semibirzw 1r depression 5 arranged cmicentrically the usual tone arm opening 6.

Seated in the depression 5 is a hollow rubber ring 7 upon which reststhe d1aphragm S, :khutting the outer surface of the dia )hra 'iu and arran edgin )arallelism Specification of Letters Patent.

sonnn-rtnrnonvcnn.

Patented May 2, 1916.

- with the first ring is a second hollow ring 9 over which passes the needle arm 11 shown in my improved IGPI'OClllCGI as lyingin close proximity to the side of the diaphragm, attachment being made to the central portion of the diaphragm by means of a screw 12. In any suitable manner, the lower remaining extremityof the needle arm is secured to a T-shaped plate 13, but I wish it to be urn derstood that the needle arm, if found advantageous, can be formed integral with the T-shaped plate. The connection between the plate and the needle arm is made at a central point in a longitudinal direction, so that the arms 14 will project equally from opposite sides of the needle arm, while the center of the arifn 15 will intersect the axis of the needle arm? The arms 14 are provided. with depressions 16. in which seat the edges of wedge-shaped bearing blocks or projections 17 that are secured. to the boss 18 of the easing in any suitable manner. The 'under surface of the plate is provided with do pressions 19 corresponding to the. heretofore mentioned depressions 1.6 and as shown receive the edges of a second, set of wedge shaped blocks 20 provided with passages 21. The said depressions l6 and 19 have all of their walls extending at an incline to the top and bottom surfaces of said plate.

' Passing through the passages 21 are the threaded shanks of bolts 22 having threaded engagement with the bosslS. Encircling that portion of each bolt between the block 20 and the bolt heag l 'is a coil spring 23, the tension of which being utilized to yield-ably force'the plate in contact withthe bearing block 17 and to yieldably force the blocks 20 into engagement with the plate. By this arrangement. it will be seen that the plate I is free to rock with a minimum. amount of friction. The arm 13- has secured thereto the shank 24: formed with a needle holder having a triangular-shaped bore 26 that is intersected by the axis of a binding screw 27' threaded into the socket.

By reterring to Fig. 8 it will be seen that the axis of the socket is in vertical aline' ment with the diaphragm 8.

From the foregoing description, it will be seen that, owing to the fact that the fulcrnm point of the plate is disposed to one side of the needle arm while the needle receivinn socket disposed to the opposite side of the needle arm, a slight pressure upon the needle within the socket will cause ter of the diaphragm through the needle the casing or a plate secured to one extremity f sa d needle threaded into ligdf easing, other arm, a needle receiving socket secured to an shaped blocks seated in and threaded into sai of Wedge-shapedhlocks enc rcl ng said belts in presence of two Witness ttaching the needle arm tQr 23 sound reproducer compris." ing a plate secured to saldneedle arm and Having described the invention, What is provided with Wedge-shaped depressions, claimed is:

an increased pressure to act upon the cen- 2 Means for a rough said plate and intermediate portion thereof, Wedge shaped main ngdepressions, and slidable on said blocks Secured to'sald casing and abuttin fSCLQWfi and "springs eneircling said screws 33 e remaining extremities of said plate, and hearing upon said secondbearing blocks threaded bolts passing through said plate at all times.

' d casing, a second set, In testimony whereof I aflizg my signature 152$. U V v y QAZRL ElLERS, springs encircling he shanks of said bolts ".YVitnesses:

between the r eads and said second set of v Oneal DROUTH,-

k v a ill op s. v I I H. SEOHLER.

Wedge-shaped bearing blocks secured to said I I aim of Said depres- 2-5 

